n=gets.to_i
bs=11
bmask=(1<< bs)-1

pq_base=[nil]
gets.split.each.with_index(1){|j,i|
  a=j.to_i<< bs
  i/=2 while i>1 && a<pq_base[i]=pq_base[i/2]
  pq_base[i]=a
}
pq_base<<1e9

el=gets.split.map{|i|(i.to_i/2<< bs)+1}
p (1..n).map{|i|
  pq=pq_base.dup
  el.rotate(i).each{|e|
    a=pq[n]
    d=pq[i=1]+e
    while (c=i*2)<n
      c+=1 if pq[c]>pq[c+1]
      break if a<=pq[i]=pq[c]
      i=c
    end
    pq[i]=a
    i=n
    i/=2 while i>1 && d<pq[i]=pq[i/2]
    pq[i]=d
  }
  pq[1..-2].map{|x|x&bmask}.max
}.min